Electric-llghting system



(No Model.)

P. W. LORD.

ELECTRIC LIGHTING SYSTEM.

Patented Aug. 24,1897

INVENTOR WITNESSES my aw Freaarw WZ07'6L by 7/Zcumm Allamey UNITED STATES PATENT OFFICE.

FREDERIO lV. LORD, OF'BOSTON, MASSACHUSETTS.

ELECTRIC-LIGHTlNC-i SYSTEM,

Y SPECIFICATION forming part of Letters Patent No. 588,683, dated August Application filed June 19, 189 7, Serial No. 641,426. (No model l To all whom/it may concern.-

Be it'known that I, FREDERIC W. LORD, a

citizen ofithe United'States, residing at Boston,,in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Electric-Li hting Systems, of which the following is a hadtherein to the accation, reference being 'companying drawings.

My invention relates to electric lighting, and particularly to theordinary incandescent systems, though it is applicable to any multiple-arc system whatever, and comprises an improvement in sockets and systems of connection of that type in which it is possible to light and extinguishany particular lamp either at, the lamp-socket or at any distant point.

In the accompanying drawings, which,illustrate a particular embodiment of my invention, Figure 1 is a view, partly in. section, of my improved socket and a diagram of the electrical connections; and Fig. 2 is a View, partly in section, at right angles to the View shown iii-Fig. 1, but with the electrical connections. omitted.

The socketitself, which may'be of a type suitedto any preferred lampbase, is shown as, consisting of the cylindrical shell 1, supis supported b y theconical shell 3.

portedby the insulating-plate 2, which in turn The P 2 supports a metal bare, which turn car ries a second. insulating-ring. 5. The upper end of the bar 4"is cylindrical. and

his 6, which makes contact with a similar annulus on the lamp-basa'as is well understood in the art. I

The key 7 controlsthrough a shaft 8, the insulating-block 9, and this block is embraced at the end and onvtwo sides by the metal strip 10, in contact with the shaft 8. Twom'etai' springs 11 and 12 are fastened to the ring 2. The mains of the lighting systenrare shown at 13 14. .From the mains-13 a wire 15 leadsto the annulus 6, while from the main 14 a wire. 16 leadst-o the contactl'? ofthe two-Way.

screw-cut to receive the thread of'th'e lampbase. The insulating-ring 5 also carries the metal annu the contact 20, connecting the spring 12 with the main 14'. From the spring 12 the circuit through the wire 16, switch-blade 18, contact 19, wire 21, to the spring 11. At this point the circuit will be broken by the insulating-block on the contact and the key 7 be turned a quarter of a revolution, the spring 12 will leave the metal .strip 10 and will rest on the 9. If, onthe other hand, the switch-18 be left block-9'. It is thenobvious that the lamp may 7 4 be extinguished eitherat the switch 18 or at the socket. In either case it will be seen by tracing the circuits that it can be .lighted either by turning the key 7 a quarter of a' rev olution or by throwing-the switch 18. In brief,

the connections are such that aturn ofthe key or a movement of the switch will in an cases light the lamp if it be extinguished and extinguishit if it be lighted.

, It will be seen that my improved, socket differs fromthe ordinary socket inthat it contains a two-way. switch instead'of the usual simple contact making and breaking switch. It therefore constitutes a two-way socket and is connected at corresponding points to the two-way switch 18;

It will be obvious that various'changes in' form and connections may be made withou" departing from the spirit of my invention. 1 do not, therefore, v arrangements shown and described, flout I-claim as my invention and desire to secure by Letters 'Paten t- 1. v The combination in an electric-lighting system of a .two-wayswitch, and a two-way pfints'to'the two-way switch, andconnctions from-the third point on the socket and on the switchto the'mfains of the system. I I

2. A two-way lamp-socket comprising limit myself to the specific.

lamp-socket connected at two corresponding means for making contact with a lamp, three contact-points connected toleading-in wires, and means for connecting one ofv the points to either of the other two, through the lamp-coir tacts. r

3. In a two-way lamb-socketthe combination of an insulating-block, with a metal strip' thereon, two springs bearing upon said block, and means for connecting either of the springs with the metal strip and at the same time disconnecting the other one of the two springs from the metal strip, substantially as described.

4. In a1a1np-socket,the combination of two spring-contacts, a rotatable switch adapted to IO make contact-with one only of the springs in FREDERIO W. LORD.

WV'itnesses:

THOMAS P. CURTIS,

EDWARD RUSSELL COFFIN. 

